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-rw-r--r--src/mbgl/style/expression/equals.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mbgl/style/expression/equals.cpp b/src/mbgl/style/expression/equals.cpp
index 08ef85e92b..6d963cc1d8 100644
--- a/src/mbgl/style/expression/equals.cpp
+++ b/src/mbgl/style/expression/equals.cpp
@@ -37,6 +37,10 @@ bool Equals::operator==(const Expression& e) const {
return false;
}
+std::vector<optional<Value>> Equals::possibleOutputs() const {
+ return {{ true }, { false }};
+}
+
static bool isComparableType(const type::Type& type) {
return type == type::String ||
type == type::Number ||